2 # Process this file with autoconf to produce a configure script.
5 AC_INIT([userspace-rcu],[0.8.8],[mathieu dot desnoyers at efficios dot com])
7 # Following the numbering scheme proposed by libtool for the library version
8 # http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
9 AC_SUBST([URCU_LIBRARY_VERSION], [2:0:0])
11 AC_CONFIG_AUX_DIR([config])
12 AC_CONFIG_MACRO_DIR([config])
15 AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
16 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
18 m4_include([config/ax_tls.m4])
20 AC_CONFIG_SRCDIR([urcu.h])
22 AC_CONFIG_HEADERS([config.h urcu/config.h])
24 AH_TEMPLATE([CONFIG_RCU_SMP], [Enable SMP support. With SMP support enabled, uniprocessors are also supported. With SMP support disabled, UP systems work fine, but the behavior of SMP systems is undefined.])
25 AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
26 AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
27 AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks cmpxchg instruction.])
28 AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction if available for use on ARM.])
29 AH_TEMPLATE([CONFIG_RCU_TLS], [TLS provided by the compiler.])
31 # Allow overriding storage used for TLS variables.
32 AC_ARG_ENABLE([compiler-tls],
33 AS_HELP_STRING([--disable-compiler-tls], [Use pthread_getspecific() to emulate Thread Local Storage (TLS) variables.]),
34 [def_compiler_tls=$enableval],
35 [def_compiler_tls="yes"])
37 # If not overridden, use ax_tls.m4 to check if TLS is available.
38 AS_IF([test "x$def_compiler_tls" = "xyes"],
39 [AX_TLS([def_tls_detect=$ac_cv_tls], [:])],
42 AS_IF([test "x$def_tls_detect" = "x"],
44 [AC_DEFINE_UNQUOTED([CONFIG_RCU_TLS], $def_tls_detect)])
46 # Checks for programs.
51 # Checks for typedefs, structures, and compiler characteristics.
56 # Checks for library functions.
59 AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf])
63 [i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"],
64 [i486], [ARCHTYPE="x86"],
65 [i586], [ARCHTYPE="x86"],
66 [i686], [ARCHTYPE="x86"],
67 [amd64], [ARCHTYPE="x86"],
68 [x86_64], [ARCHTYPE="x86"],
69 [powerpc], [ARCHTYPE="ppc"],
70 [ppc64], [ARCHTYPE="ppc"],
71 [powerpc64], [ARCHTYPE="ppc"],
72 [powerpc64le], [ARCHTYPE="gcc"],
73 [ppc], [ARCHTYPE="ppc"],
74 [s390], [ARCHTYPE="s390"],
75 [s390x], [ARCHTYPE="s390"],
76 [sparc], [ARCHTYPE="sparc64"],
77 [sparc64], [ARCHTYPE="sparc64"],
78 [alpha*], [ARCHTYPE="alpha"],
79 [ia64], [ARCHTYPE="gcc"],
80 [arm*], [ARCHTYPE="arm"],
81 [aarch64], [ARCHTYPE="gcc"],
82 [mips*], [ARCHTYPE="mips"],
83 [tile*], [ARCHTYPE="gcc"],
90 UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
91 ARCHSRC=urcu/arch/$ARCHTYPE.h
93 AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
94 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
97 AS_IF([test "$host_cpu" = "armv7l"],[
98 CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
101 # ARM-specific checks
102 AS_IF([test "x$ARCHTYPE" = "xarm"],[
103 AC_MSG_CHECKING([for dmb instruction])
104 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
107 asm volatile("dmb":::"memory");
113 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
119 # Tile-specific checks
120 AS_IF([echo "$host_cpu" | grep "^tile"],[
121 AC_MSG_CHECKING([for Tile architecture type])
122 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
130 AC_MSG_FAILURE([URCU has only been tested on the TileGx architecture. For other Tile* architectures, please run the tests first and report the results to the maintainer so that proper support can be added.])
134 # x86-specific checks
135 AS_IF([test "x$ARCHTYPE" = "xx86"],[
136 AC_MSG_CHECKING([if architecture really supports the mfence instruction])
137 #For now, using lock; addl compatibility mode even for i686, because the
138 #Pentium III is seen as a i686, but lacks mfence instruction.
139 #Only using fence for x86_64.
140 AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"],[
142 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
148 # Check if sys_futex() is available
149 AC_MSG_CHECKING([for sys_futex()])
150 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
151 #include <sys/syscall.h>
153 #error "futexes not available"
158 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
165 AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
166 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
167 AM_CONDITIONAL([NO_SHARED], [test "x$enable_shared" = "xno"])
169 # smp-support configure option
170 AC_ARG_ENABLE([smp-support],
171 AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
172 [def_smp_support=$enableval],
173 [def_smp_support="yes"])
174 AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
177 # From the sched_setaffinity(2)'s man page:
179 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
180 # The library interfaces were introduced in glibc 2.3. Initially, the
181 # glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
182 # the cpuset size argument was removed, but this argument was
183 # restored in glibc 2.3.4.
186 # In addition to that, some vendors ported the system call to 2.4
189 # Furthermore, when the function first appeared, the MASK argument was
190 # an unsigned long pointer, while later it was made into a cpu_set_t
191 # pointer. Systems that have the cpu_set_t version also should have
192 # the CPU_ZERO, CPU_SET, etc. macros.
194 # All this mess means we have to cater for at least 3 different
195 # sched_setaffinity prototypes:
198 # int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
199 # int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
200 # int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
203 # Since we define _GNU_SOURCE in the sources, must do so too in the
204 # autoconf tests, as defining _GNU_SOURCE or not exposes
205 # sched_setaffinity bits differently.
207 CFLAGS="$CFLAGS -D_GNU_SOURCE"
209 AC_CHECK_TYPES([cpu_set_t],
210 [have_cpu_set_t="yes"],
211 [have_cpu_set_t="no"],
212 [#include <sched.h>])
214 # Confirm that we have CPU_ZERO, and it actually works.
215 AC_MSG_CHECKING([whether CPU_ZERO works])
216 AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
217 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
222 cpu_set_t foo; CPU_ZERO(&foo);
227 AC_DEFINE(HAVE_CPU_ZERO, 1)
233 # Confirm that we have CPU_SET, and it actually works.
234 AC_MSG_CHECKING([whether CPU_SET works])
235 AH_TEMPLATE([HAVE_CPU_SET], [Defined to 1 if we have CPU_SET and it works])
236 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
241 cpu_set_t foo, mask; CPU_SET(0, &foo);
246 AC_DEFINE(HAVE_CPU_SET, 1)
252 # First check if the function is available at all.
253 AC_CHECK_FUNCS([sched_setaffinity],[
254 # Okay, we have it. Check if also have cpu_set_t. If we don't,
255 # then we have the first version using unsigned long, and no
256 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
257 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
258 # should also be present, but we confirm nonetheless.
260 AS_IF([test "x$have_cpu_set_t" = "xyes"], [
262 # Check how many arguments does sched_setaffinity take.
264 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
265 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
270 sched_setaffinity(0, sizeof (foo), &foo);
275 [sched_set_affinity_args=3],
276 [sched_set_affinity_args=2])
277 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS,
278 $sched_set_affinity_args,
279 [Defined to sched_setaffinity's number of arguments.])
280 AC_MSG_RESULT([$sched_set_affinity_args])
282 # No cpu_set_t, always 3 args.
283 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
291 urcu/uatomic.h:$UATOMICSRC
296 doc/examples/Makefile
298 tests/common/Makefile
300 tests/benchmark/Makefile
301 tests/regression/Makefile
311 # Report on selected configure options
312 AS_IF([test "x$def_smp_support" = "xyes"],[
313 AS_ECHO("SMP support enabled.")
315 AS_ECHO("SMP support disabled.")
318 AS_IF([test "x$def_tls_detect" = "x"],[
319 AS_ECHO("Thread Local Storage (TLS): pthread_getspecific().")
321 AS_ECHO("Thread Local Storage (TLS): $def_tls_detect.")